Bought this on a bit of a whim, as I wanted to try a square filter system. My friend tried to persuade me against them saying they would be slow and take up too much space, recommending the circular filters instead. I have bought the K&F Concept variable ND, and I have to say it is much easier to fit and carry around. However, if you want to take landscapes, then the square system is far superior with its Grad ND glass, coloured glass and ability to stack glass on top of each other. Firstly though, these are not glass they are resin. Also, you have to remember you get 40 different filters, 2 filter holders and most lens adaptors for under £40!! A single Nisi filter alone would cost over £100. So remember there is always an element of you get what you pay for. HOWEVER, you do get ALOT more than you pay for with this set up. You get everything you could possibly want to try this type of set up and get very good results. If you are looking to get a regular spot on National geo then maybe you will want one of their higher quality set ups, but for everything else this does guys what you need it to. I mainly used it so far to grad the bright sky and keep detail in the foreground. I have played with a couple of the colours too with some good results meaning less messing in post production. If you want to try a square system, this is the one. If it works, and if you progress beyond hobby photographer then yeah, you may be upgrading but you will have a good idea of the filters you have used, and need to buy again. For the money, you cant beat it.The only draw back is no labeling on the filters (but it's not hard to know what they are and lay them out in the cases accordingly.I forgot to mention the 4 cases they come with, good quality and do the job. Remember, all this for under £40!! You cant go wrong.